Fastening for door-knobs.



UB ITED STATES HDW-ABD GRIFFIN, QF SOMEBVILLE, MASSACHUSETTS.

FASTENING POR DOOBJNOBS.

Spectcation ot Letters Patent.

Patented A ug. 19, 1 91 3.

Application led March 7, 1912. Serial Ho..682,103.

Y2: all whom. il may concern:

lie it known that. l', Enwwkn B. Ghirri-N, a citizen of the United States, residing at Somerville, in the co unt v of Middlesex and State of )Iassm-littsetts, have invented cerg' tain new and useful Improvements in Fastenings for Door-Knobs, of which the following is :t spccilitutions This invention relates to door-knobs and thc like. and has for its objectto provide :t simple and etlicicnt means for fastening the same io thc spindle.

The invention also has for its object to provide a fastening which will render impoihhthe removal of the knob and its spindh` from thc outside of the door.

'ith tht-se and other objects in view. as will appear when the nature of the invention is better understood, the same consists in a novel construction and arrangement of parts to be hereinafter described and claiincd.

In the accompanying drawing, Figure 1 is an elevation of the spindle, partly broken awa y; Fig. 2 is a. longitudinal section showing the means for fastening the knob to the spindle, and `Fig. 3 is a cross-section on the line 3-3 of Fig. 2.

Referring specifically to the drawing, 5 denotes a. knob-spindle having at one of its ends a knob G which is formed integral with the spindle for a purpose to be presentl described. To the otherend of the spin e is attached a knob 7, the fastening of which is so constructed that neither said knob nor the spindle can be removed from the outside of the door;

The fastening comprises the, following parts:The end of the spindle 5 carrying the knob 7 is split longitudinally for a short distance, as indicated at S` and has a central longitudinal bore 9 which is screw-threaded and intersected by the split. The spindle is nare in cross-section and the split extends diagonally from corner to corner. The knob 7 has a. shank 10 provided with a longitudinal bore 11 to receive the spindle and from -the outside of the knob, a bore 12 extends to the bore 11. The bore 12 is in axial alinement with the bore 9 when the knob is on the l spindle. and s. screw 13 passes through the former andts screwed into the 'zatter bore.

2 that portion of the screw which enters the i last-mentioned bore heilig tapered. The diameter of thc larger portion. of the screw is greater tha-n the diameter of the bore t), in vicw of which the split. portion of the spindle will spread when the screw enters the sante. and said-portion ot' the spindle will tlwrefore be tightly wedged in the bore ll. lnastnuch as the spindle is split diagonally. the bore will be titled more completely b v the expanding portion of the spindle. The bore 11 is alsotapered for the same purpose. 'lht` shank 10 may be formed integrati with the knob lT, or separate. and secured thereto in any suitable manner. The head of tht` screw 13 is countersunk in thc knob. .'f the spindle is made of softer metal than the screw, the bore 9 need not, be screwthreaded, as the screw will cut a thread in the borc when it enters the same.

In applying the structure herein described, the knob t3 will be in the outside of the door, in view of which it will be imponible to reon either knob tightens the fastening.

The advantages of the fastening herein described are that it. can be easily and quickly applied, thus saving time and labor, it has a smaller number of parts than the -ordinary knob fastening, one screw only being required, and it securely faslens the knob in place on the spindle, so that it is not liable to work loose. The fastening can also be applied to handles for dressers, drawers, etc.

The combination with a door knob pro- -vided with a tapering recess having its major diameter at. its inner vnd. said knob heilig further provided with an opening leading from the inner cnd of the recess to the outer face of theknoh, ttnouter cud of the opening being enlarged to pun-ide aA shoulder within the knob; of a spindle provided with a. splitend, said spindle further havi the inner sides of the split portion provi ed with rew threads, and a tapering more it from this side of the door. A pull screw passing through said opening and en- In testimony whereof I aix my signs.-

sald screw thread in the spindle, snd tuxfe in presence of two witnesses.

screw a. head-on its ter end on the sh der in the 1:11331 wheby mi EDWARD B GRIFFIN' l screw is adapted tosimultaneously draw. 'Witneesz u said spindle into said re and expand the AGNES W.' Gxnm,

split portion. Lomsx C. AxnNmN.

copia .f um peut any be ma m m ma ma, i, umg um cmmmu or retenu, Wallington, D. 0." 

